نتایج جستجو برای: melting points

تعداد نتایج: 291120  

Journal: :The journal of physical chemistry. A 2006
Saman Alavi Donald L Thompson

Molecular dynamics simulations are performed to determine the melting points of aluminum nanoparticles of 55-1000 atoms with the Streitz-Mintmire [Phys. Rev. B 1994, 50, 11996] variable-charge electrostatic plus potential. The melting of the nanoparticles is characterized by studying the temperature dependence of the potential energy and Lindemann index. Nanoparticles with less than 850 atoms s...

Journal: :Journal of chemical information and computer sciences 2002
James S. Chickos Gary Nichols Paul Ruelle

Melting points and fusion enthalpies are predicted for a series of 81 compounds by combining experimental solubilities in a variety of solvents and analyzed according to the theory of mobile order and disorder (MOD) and using the total phase change entropy estimated by a group additivity method. The error associated in predicting melting points is dependent on the magnitude of the temperature p...

Journal: :Acta Crystallographica Section A Foundations of Crystallography 2009

Journal: :Clinical materials 1993
B J Pol L van der Does A Bantjes

Polyethers were studied as potential materials for vascular prostheses. By crosslinking poly(tetramethylene oxide)(PTMO) with poly(ethylene oxide)(PEO), hydrophilic networks were obtained containing PTMO as well as PEO. Attempts were made to reduce the crystallinity and melting point of PTMO because of the required elastomeric behaviour at body temperature. Compared to non-crosslinked PTMO, c...

Journal: :Physical review letters 2003
M Schmidt J Donges Th Hippler H Haberland

Energetic and entropic influences on the melting temperatures of size selected sodium clusters are experimentally separated. It is shown that the energetic difference between solid and liquid is the leading influence for the still puzzling features in the size dependence of sodium melting points. Additionally, this energy difference decreases towards smaller cluster sizes and causes steplike me...

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